[PropertyInfo] Auto-enable PropertyInfo component

src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php

@@ -21,6 +21,7 @@ use Symfony\Component\Config\Definition\ConfigurationInterface;
 use Symfony\Component\Form\Form;
 use Symfony\Component\Lock\Lock;
 use Symfony\Component\Lock\Store\SemaphoreStore;
+use Symfony\Component\PropertyInfo\PropertyInfoExtractorInterface;
 use Symfony\Component\Security\Csrf\CsrfTokenManagerInterface;
 use Symfony\Component\Messenger\MessageBusInterface;
 use Symfony\Component\Serializer\Serializer;
@@ -833,7 +834,7 @@ class Configuration implements ConfigurationInterface
             ->children()
                 ->arrayNode('property_info')
                     ->info('Property info configuration')
-                    ->canBeEnabled()
+                    ->{!class_exists(FullStack::class) && interface_exists(PropertyInfoExtractorInterface::class) ? 'canBeDisabled' : 'canBeEnabled'}()
                 ->end()
             ->end()
         ;

src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php

@@ -219,7 +219,7 @@ class ConfigurationTest extends TestCase
                 'throw_exception_on_invalid_index' => false,
             ),
             'property_info' => array(
-                'enabled' => false,
+                'enabled' => !class_exists(FullStack::class),
             ),
             'router' => array(
                 'enabled' => false,

src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTest.php

@@ -1153,12 +1153,6 @@ abstract class FrameworkExtensionTest extends TestCase
         $this->assertFalse($container->hasDefinition('serializer'));
     }
 
-    public function testPropertyInfoDisabled()
-    {
-        $container = $this->createContainerFromFile('default_config');
-        $this->assertFalse($container->has('property_info'));
-    }
-
     public function testPropertyInfoEnabled()
     {
         $container = $this->createContainerFromFile('property_info');